Service difficulty report · Skin · Boeing 7377H4

Difficulty date
May 12, 2021
Submitted
June 30, 2021
Operation
Air carrier
Aircraft
N400WN
Make and model
Boeing 7377H4
Aircraft serial
27891
Aircraft time
66,325 hours, 39,077 cycles
Part
Skin
Condition
Cracked
Location
L1 Door
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

L-1 DOOR ASSY AFT UPPER CORNER CRACKED AT EDGE MKD DOT ; / PERFORMED HFEC ON CRACK AT UPPER CORNER EDGE OF L-1 DOOR ASSY IAW NDTM PART 6 ;51-00-00 PROCEDURE 26. CRACK CONFIRMED WITH LENGTH : 0.196' VERIFIED REWORKED AREA IS IN LIMITS PER B737-700 SRM 51-10-02 -1A-1 FIG 103 DETAIL C; [09] OK TO TREAT AND PRIME REWORKED AREA; [10] TREATED REWORKED AREA WITH ALODINE AND PRIMER AS PER B737-700 SRM 51-20-01; [11] AFTER REWORK AREA FOUND OUT LIMITS MAT.LOSS 0.196''AS PER B-737-700 SRM 52-10-02-1A-1 FIG.103 DETAIL C.; [12] STEP 11; AFTER REWORKED AREA ON STEP 4 (REMOVING CRACK) FOUND OUT OF LIMITS PER B737-700 SRM 52-10-02-1A-1 FIG.103 DETAIL C. MATERIAL LOSS 0.196'; MAX. MAT. ALLOWED TO REMOVE 0.150'.; ACCOMPLISHED 0.040' INSURANCE CUT AT TRIMMED AREA AND EVALUATED SURFACE ROUGHNESS FOUND TO BE SMOOTHER THAN 63 MICROINCHES RA ON TRIMMED AREA REF B737-700 SRM 51-20-13-0G-0 AND EA# 21-151-01668-WIP1; TOOL USED B/C #171854.; [29] VERIFIED ACCOMPLISHED 0.040' INSURANCE CUT AT TRIMMED AREA AND EVALUATED SURFACE ROUGHNESS FOUND TO BE SMOOTHER THAN 63 MICROINCHES RA ON TRIMMED AREA REF B737-700 SRM 51-20-13-0G-0 AND EA# 21-151-01668-WIP1; TOOL USED B/C #171854.; [30] ACCOMPLISHED A GENERAL VISUAL INSPECTION; AS DEFINED IN 737-700 SRM 51-00-06 PARAGRAPH 3 OF ALL AREAS WITHIN THE REPAIR; [31] FABRICATED THE -1 REPAIR DOUBLER

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